Grate bar to burn pulverized coal



Jar'x. 22, 1924.

F. HERKENRATH GRATE BAR TO BURN PULVERI'ZED COAL Filed Nov. 1, 1921 2 sheets-Smet 1 all@ 7 I Iv II'vI/.ENTOR Afm/M www WM A TTORNE Y dan. 22, 1,924.

"112181,366 F. HERKENRATH GRATE BAR T0 BURN PULVERIZED COAL Filed Nov. 1, 1921 2 sheets-sheet 2 '7W maw 77% ditta may Fatented dan. 22, 1924.

PATENT vries.

FRANCISCO I-IERKENRATI-I, F SANTIAGO, CHILE.

G1R/ATE BAR TO BURN PUL'VERIZED COAL.

Application led November 1, 1921.

T o all whom t may concern.'

Be it known that I, F nANoIsco HERKEN- BATH, a citizen of Germany, residing at Santiago, (Jhile, have invented new and use- 5 ful Improvements in Grate Bars to Burn Pulverized Coal, of which the following is a specification.

:'lhis invention relates to an improved grate bar, the object of the invention being to provide a grate bar which may be used in furnaces generally, but is more especially adapted for use in factory furnaces, which grate bar furnishes a simple and eiiicient means for permitting pulverized fuel to be 16 burned with very little loss.

It is well known that the process of burning pulverized coal has met, up to now, with such difiiculties as to render it entirely inadequate, although various methods have 20 been resorted to. These experiments have resulted inthe designing of machines and processes whereby the pulverized fuel is reagglutinated by means of compression into the shape of briquettes, but this method has z5 not provided a practical solution of the matter.

The pulverized waste or attle left in the neighborhood of coal mines is really enormous and finds no market whatever. It is a0 readily understood that if this waste could be put to practical use and beneiit derived from the great amount of potential calories therein available, the scheme would prove a great success as a business proposition.

The main feature of the present invention is to provide the desired and necessary means to attain this result, providing a system of furnace grating composed of bars, of suit-able material, such as cast or other so iron so formed and assembled as to produce a. plurality of nuclei or incandescent focuses, very close to each other and uniformly spread over the surface of the grating.

Another main object of this invention is 4&5 to provide a grate bar of such design that it will efiiciently prevent the powdery fuel from falling through with the ashes, until it has been completely burned.

A further characteristic of the invention M is to provide for the admission of air in a suflicient quantity and at a uniform pressure over the entire surface of the grating, in the form of small counterposed jets, thus Serial No. 512,075.

avoiding the dispersion of the fuel and the surging of flames against the walls of the furnace.

In the accompanying drawings, which illustrate an embodiment of the invention, j

Fig. l is a plan view, broken away, illustrating three bars assembled to form a grate;

Fig. 2 is a transverse section taken 0n the line 22 of Fig. l, looking in the direction of the arrows;

Fig. 3 is a central, longitudinal section of one of the grate bars;

Fig. i is a side elevation thereof; and

Fig. 5 is a transverse section of a single bar taken through the center of one of its so-called iues.

The same characters of reference designate the same parts in the different figures of the drawings.

Referring to the drawings, the bar l is cast intermediate its ends in the shape of a U beam, 2 indicating the horizontal portion and 3 the vertical strengthening ribs forming the side walls. rhe bar is preferably solid at its ends and is provided at one end with an undercut groove 4 adapted to engage the usual supporting crossbar (not shown), the opposite end being beveled at its underside, as shown at 5, in order to provide for expansion and contraction of the bar.

The horizontal portion 2 of the bar is provided along its longitudinal edges with a plurality of recesses of approximately semi-conical shape, the recesses at one side being disposed in staggered relation to those at the opposite side edge. Between said recesses a plurality of laterally extending perforations 7 are drilled in the horizontal portion, said perforations communicating at their inner ends with vertically extending recesses 8 formed in the underside of the member 2.

The grating is assembled by placing the bars l side by side with the longitudinal sides in juxtaposition, as shown in Fig. 1. In this position, the perforations 4" at each side of one bar will communicate with the recesses 6 of the hars adjacent thereto, so that the air drawn by the draught or fed by a blower, leaves the perforations and spreads horizontally through the recesses 6 upward.

Furnace grating composed of bars of the type herein described has been demonstrated in actual practice as etiicient in every respect, and that pulverized coal can be successfully burned thereon.

Having thus described my invention, what I claim is:

l. A grate bar having a plurality of vertical recesses extending into the bar from the underside thereof, a plurality of horizontal perforations extending` into the bar at the sides thereof and communicatingwith said vertical recesses, and a plurality of recesses at the top edges of 'the bar between the horizontal perforations thereof.

2. A grate bar having a plurality of vertical recesses extending into the bar from the underside thereof, a plurality of horizontal perforations extending` into the bar at the sides thereof and communicating with said vertical recesses, and a plurality of recesses at the top edges of the bar between the horizontal perforations thereof said last recesses being` approximately of semi-conical form. 3. A grate bar havinga plurality of vertical recesses extending into the bar from the underside thereof, a plurality of horizontal perforations extending into 'the bar at the sides thereof and communicating with said vertical recesses, and a plurality of recesses at the top edges of the bar between the horizontal perforations thereof said last recesses beingapproximately of semi-conical form, the perforations and recesses at one side of the bar being disposed in staggered relation to those at the opposite side thereof.

In testimony whereof I have signed my name to this specification.

FRANCISCO HERKENRATl-l. Witnesses:

F. WARNECKER, M. VERGARA S. 

